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It started to deviate from my original question, and before it goes too far, I accept the answer by RudiC Thanks again for all your replies.

Thanks Don and all!
What I was doing is to combined two files (each half million lines) by a matching column, if no match (0.01%), make up the missing fields with the "-", which triggered me asking...

Can I say there is no regexp for this case in awk, similar to your perl script ?perl -e '{print "-\t"x11, "-\n"}'
Thanks a lot!

Thanks!
Can you elaborate your script, please?

How to use regexp to print out repetitive pattern in awk?
$ awk '{print $0, "-\t-\t-\t-\t-\t-\t-\t-\t-\t-\t-\t-"}' output:
- - - - - - - - - - - -I tried following...